If you're going to get the tap water and refill a bottle consider the Brita sports bottles they sell that have a filter in the part you suck the water out of to help remove some of the taste. Also consider bringing those little flavor sticks they sell to make some of the water iced tea, fruit punch, lemonade etc. You really need to drink about 1 cup of water per hour when out in the summer sun in the humidity down there, but there comes a point when you simply don't want to. The flavor sticks help it go down easier (although they're obviously not compatable with the brita filter bottles).
Bring at least 2 and possibly 3 pairs of shoes for each person. That lets you completely dry the sweat/water out of each pair before you have to wear it again. Soggy shoes are havoc on the feet. You may want to bring BodyGlide anti-chafing stuff along too. It goes on like solid deodorant and helps reduce skin irritation. The hot wet sticky tends to make that first. Works great on the feet, and also anyplace clothing might rub - bra straps, bra underwires, thighs etc.
